My plan is to have a turn around for my HO layout in a separate room from the rest of the track. The notched out portion of the design is the rock wall I must cut around to get into the other room. To put the space to work, and to show off the layout, as this will be the first thing viewed by visitors, I've planned a quarry on a local site. It will be a quarry that processes and ships ground calcium carbonate. They ship out about 10 covered hoppers a day and up to 3 boxcars a day. I would love your opinion on the location and length of the siding and spur that comes off it. Also, what are your thoughts on the storage track extended from the siding? Will it switch easily, is there enough room to drop off and pick up on the same trip? Etc.? Thanks!!!!!!!!!!!!!!!!!!